If you go to the item listing again and hit the tab for Shipping, do you see two or three different postage options? If not, assume that what you see is the only choice for you and one for which you do not care to pay. Look elsewhere for a similar item from another seller who has a cheaper rate that you prefer. After you win the auction (or use buy-it-now to secure it) as a buyer you can't ask the seller for a less expensive method of shipment. That is an ebay no-no and one for which you can be reported as violating policy. Too many 'reports' of that nature and ebay starts to give that member the wrong kind of attention.
Sometimes sellers use couriers instead of postal mail and it costs more because there is customs brokering involved if it is crossing a border.
Sometimes they really have no idea what it costs and pad extra into it.
Sometimes sellers have their international shipping set up to dissuade buyers from outside their country because they just don't want the hassle of dealing with customs forms.
Sometimes sellers use a 'sell similar' function to create a new listing but forget to change the item weight or size so it displays incorrect pricing.
If the seller, however, has not responded to your requests for clarification, move on. This to me is a clear indicator that they are not interested in gaining your trust as a potential customer. If that is the case, imagine what will happen if you have an actual problem with the item after he/she has your money in hand.
